Thank you for your message.
What does the Red Checkbox mean?
The Red Checkbox means that you have auto-ping feature enabled
in connection properties and either the remote PC is unreachable
or it's an Internet-ID connection
(and auto-ping works for direct connections only).
How do I get rid of the red checkbox by a remote PC.
Please check if the auto-ping function is enabled:
1) Right-click on the Remote Host and select Properties
2) In the connection properties window, go to the Auto-ping section and deselect the checkbox:
You can learn more about the auto-ping feature here
We would also recommend you to update your Viewer to the current version 188.8.131.52. It's available for downloading here
Please let me know if you have further questions.